To: Bill Jackson who wrote (68577 ) 8/11/1999 8:21:00 PM From: Petz Read Replies (2) | Respond to
Bill, re:peak power, etc.only occurs if the Vcc is jacked up to 2.3 volts! Allowing for this, the current draw at 2.2 volts would only be 10.76A. The discrepancy just shrunk to 3 watts or 13%. This amount is explainable for very short term peak current demands (much less than one millisecond) which occur occasionally but average out to zero. (There are also valleys.) For proof of this fact (Paul, are you listening?) notice that the Athlon spec specifies a "rate of change" for current draw of 30 AMPS per microsecond! Also from the very first paragraph of the VR design note:"Due to the large number of transistors that can switch simultaneously, power supply designs must meet large transient power requirements." A small amount of the 13% discrepancy is also explained by the fact that the CPU is connected to the chipset and other loads which draw and dissipate power from the bus."These projected values allow designers to support future processors on the same motherboard, thereby allowing upgradeability.." about 6% faster than 650 MHz , is just around the corner. (If it weren't just around the corner, it would be on 0.18æ!) 700 MHz, anyone?
